MINNEAPOLIS--(BUSINESS WIRE)--Possis Medical, Inc. (NASDAQ:POSS) a developer, manufacturer and marketer of pioneering medical devices for the cardiovascular and vascular treatment markets, today announced that its board of directors has extended its authorization to repurchase additional shares of the company’s common stock under a stock repurchase program, effective January 1, 2007. Possis’ board also has amended its Shareholder Rights Plan effective December 23, 2006.